*Article* **Frequency Support of Smart Grid Using Fuzzy Logic-Based Controller for Wind Energy Systems**

### **Marcelo Godoy Simões 1,\* and Abdullah Bubshait 2**


Received: 22 February 2019; Accepted: 19 April 2019; Published: 24 April 2019

**Abstract:** This paper proposes a fuzzy logic-based controller for a wind turbine system to provide frequency support for a smart grid. The designed controller is aimed to provide an appropriate dynamic droop rate depending on the local measurements of each wind turbine of a wind farm such as the maximum power available and the amount of power reserve. The designed fuzzy controller depends on the rate of change of frequency (ROCOF) at the point of common coupling (PCC). The main advantage of the proposed fuzzy controller is to provide frequency support by the wind turbine system connected to a smart grid. The dynamic rate of the controller is defined by the fuzzy sets considering the change in the grid's frequency and the available reserve power. First, the response of static droop curves is investigated for different scenarios of wind turbines connected to a smart grid. Then, the proposed fuzzy logic-based droop controller is integrated into the system, and its performance and response are evaluated, and the results are compared with static-droop based controller. The proposed controller is tested using Matlab\Simulink.

**Keywords:** droop curve; frequency regulation; fuzzy logic; the rate of change of frequency; reserve power; smart grid
